See here for User Guide
Working this way you can use Shots Holds and Pushes in UserTracks, and be able to regenerate any section. This is then just dragged n dropped into Biab.
This is taking a UserTrack from here Guitar Acoustic Nylon Arpeggio Ev8 120 + Endings, Shots n Holds
listed here https://www.realband.org/usertracks.html
some of them are old links so if you have download problems you need to copy the link and add an "s" to http:\\ so you have https:\\

we can add all the SGU/WAV to one track in Reaper as there is no 255 bar limit.


Watch Video: https://www.dropbox.com/s/ih9parpcnlcc5dm/ITC-UserTrack-Holds.mp4?dl=0

Chords: C Cm C7 CMaj7 Cm7 CMaj7b5 Cdim C7sus C6 Caug Csus
You can use so many different formats in Reaper including midi, below are wav flac and mp3 to try
If you don't have WinRar you can use 7zip
To look at the usertrack go to View > Region Manager right click Import Guitar, Acoustic, Nylon Arpeggio Ev8 4-4 120bpm.cvs from instrument folder then drag and drop the Guitar, Acoustic, Nylon Arpeggio Ev8 4-4 120bpm.wav flac or mp3 into Reaper.
The wav has the region chord name written to cues in the wav.
Enable in Action window, run "View: Toggle show media cues in items"
Guitar, Acoustic, Nylon Arpeggio Ev8 4-4 120bpm.rar
Guitar, Acoustic, Nylon Arpeggio Ev8 4-4 120bpm mp3.zip
Guitar, Acoustic, Nylon Arpeggio Ev8 4-4 120bpm flac.zip

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https://stash.reaper.fm/u/ReaTrak (Scripts for Biab Reaper)
Open SGU in Reaper Instantly